马老师的WoTou生产消费线程讲解例子

public class ProducerConsumer {
public static void main(String[] args) {
SyncStack ss = new SyncStack();
Producer p = new Producer(ss);
Consumer c = new Consumer(ss);
new Thread(p).start();
new Thread(p).start();
new Thread(p).start();
new Thread(c).start();
}
}

//定义一个WoTou类，在类中有id以标记是哪个窝头，重写了toString方法
class WoTou {
int id;
WoTou(int id) {
this.id = id;
}
public String toString() {
return "WoTou : " + id;
}
}

//定义一个篮子的对象，用于装WoTou，在类中有push方法，用于装WoTou，pop方法，用于吃WoTou
class SyncStack {
int index = 0;
WoTou[] arrWT = new WoTou[6];
/*
*wate()只有在锁定（synchronized）的时候才能使用
*/
//push用于装WoTou，当WoTou数达到6时wait（）休息
public synchronized void push(WoTou wt) {
while(index == arrWT.length) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
//唤醒瓦特（）
this.notifyAll();
arrWT[index] = wt;
index ++;
}

//pop用于吃WoTou，当WoTou数为0时wait（）
public synchronized WoTou pop() {
while(index == 0) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.notifyAll();
index--;
return arrWT[index];
}
}

//继承Runnable接口，实现run方法的Producer类，一个对象只生产20个WoTou
class Producer implements Runnable {
SyncStack ss = null;
Producer(SyncStack ss) {
this.ss = ss;
}

public void run() {
for(int i=0; i<20; i++) {
WoTou wt = new WoTou(i);
ss.push(wt);
System.out.println("生产了：" + wt);
try {
Thread.sleep((int)(Math.random() * 200));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}

//继承Runnable接口，实现run方法的Consumer类，一个对象只消费20个WoTou
class Consumer implements Runnable {
SyncStack ss = null;
Consumer(SyncStack ss) {
this.ss = ss;
}

public void run() {
for(int i=0; i<20; i++) {
WoTou wt = ss.pop();
System.out.println("消费了: " + wt);
try {
Thread.sleep((int)(Math.random() * 1000));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}